Effect of electrical potentials on tool wear and measurement of electrostatic voltage in machining of air-dried douglas-fir [Pseudotsuga menziesii]
2006
Fukuda, H.(Ryukyu Univ., Nishihara, Okinawa (Japan)) | Banshoya, K. | Murase, Y.
To clarify the effect of electrical potentials on the tool-wear progression of high-speed steel tools in the machining of air-dried Douglas-fir (Pseudotsuga menziesii FRANCO), tool-life tests of planer knives or machine bits were conducted by applying electrical potential of - 2, - 1, 0, + 1, or + 2 kV to the tool. When applying - 2 kV to the tool, tool wear for each tool progressed extremely slowly due to the suppressive effect of cathodic protection on corrosive wear. However, when applying + 2 kV to the tool, tool wear for each tool progressed rapidly. In the machining of air-dried Douglas-fir, the effect of the electrical potentials was clearly seen, producing the same results as with wood of high moisture content. The effect was more remarkable with the machine bit than the planer knife. Furthermore, cutting tests with a sharp knife or a worn knife were carried out without applying any electrical potential. The voltage of the static electricity of the knife during cutting was measured, and the electrostatic effect as the cause of tool wear was discussed. During cutting, electrical discharges between tool and work piece occurred repeatedly. The measured voltage of static electricity was higher for the sharp knife than for the worn knife.
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